Motion transfer device position lock mechanism



F. E. SMITH April 12, 1966 MOTION TRANSFER DEVICE POSITION LOCK MECHANISM I Filed March 9, 1964 4 Sheets-Sheet l 4 Sheets-Sheet 2 jja j'z'derzw 5' @erzws 4 I fi L @EU.) 5 4 W I a 0 0 r0 0 7 2 4 1 m m @WV 0 5% W! 9 W n 0 MW HI 3 N Y F. E. SMITH April 12, 1966 MOTION TRANSFER DEVICE POSITION LOCK MECHANISM Filed March 9, 1964 1 JZZ ill 64. ga L jZZ 0 Z0 2 94/ .4 E- k April 12, 1966 F. E. SMITH MOTION TRANSFER DEVICE POSITION LOCK MECHANISM Filed March 9, 1964 4 Sheets-Sheet 3 April 12, 1966 s TH 3,245,270

MOTION TRANSFER DEVICE POSITION LOCK MECHANISM Filed March 9, 1964 4 Sheets-Sheet 4 United States Patent 3,245,270 MOTION TRANSFER DEVICE POSITION LOCK MECHANISM Floyd E. Smith, 3430 Glenside Ave., Erie, Pa. Filed Mar. 9, 1964, Ser. No. 350,207

7 Claims. (Cl. 74-20) The present invention relates to an improvement in a motion transfer device of the character which translates intermittent reciprocatory motion into a combined rotational and axial motion; and more particularly to a motion transfer device position lock.

Motion transfer devices which translate intermittent reciprocating motion into rotational movement with axial movement at the termination of the rotational movement are described in co-pending patent application Serial No. 191,129, filed April 30, 1962. Such a device is readily employed in automatic assembly operations of varying scopes and capacities. For example, in the manufacture of golf balls a motion device of this character can pick a golf ball off the assembly line, move the same into position where it is imprinted with the manufacturers name and any suitable trademarks, and return the same to the production line. The motion is positively controlled within the motion transfer device, and accordingly there are no complex relays, solenoids, or hydraulic lines and cylinders involved which may require regular maintenance. In a mechanical device for motion transfer, it is important to constantly eliminate sources of wear and breakage, and render the same readily repairable in the event such occurs.

The present invention stems from the discovery that by using a particular construction of the interior elements of a motion transfer device, a positive dynamic lock can be achieved at the terminal portion of the rotational motion by the employment of an arcuate wheel engaging a mating arcuate shoulder on part of the rotational assembly in a close friction interfit in such a manner that the power transfer may continue while the terminal position of the rotational member is locked against further rotation and simultaneously guided for axial positioning.

In view of the foregoing, it is the principal object of the present invention to provide for positive positioning of a motion transfer device and assisting in locking the same at the terminal ends of its rotational motion. Another related and principal object of the in vention is directed to the reduction in lost motion and back-lash due to constant wear which is coordinated with the positive positioning lock.

Still another object of the invention is to provide a motion transfer device positioning lock and related auxiliary equipment which inherently has a long relatively maintenance-free life, and is susceptible of operation in an oil bath at all times.

Still another object of the invention is to provide for external adjustability of the rate of operation, and also of the lost motion compensating features. A related and more detailed object of the invention is to provide for the replacement of the less durable elements of the subject motion transfer device and positioning lock without disassembly of the entire unit.

Still another and more detailed object of the invention looks to the maximizing of wearing surfaces in order to reduce inaccuracies attributable to the inherent wear in any mechanism throughout its continuous operation.

Further objects and advantages of the present invention will become apparent as the following description of an illustrative embodiment proceeds, taken in conjunction with the accompanying illustrative drawings in which:

FIG, 1 is a perspective view of a motion transfer de- 3,245,270 Patented Apr. 12, 1966 vice illustrative of the present invention showing its principal external appearance and elements.

FIG. 2 is an enlarged, exploded, perspective view of the principal parts of the subject motion transfer device and position lock.

FIG. 3 is a top view of the subject motion transfer device and position lock with the cover portion thereof removed.

FIG. 4 is a transverse sectional view of the motion transfer device and position lock taken along section line 4-4 of FIG. 3.

FIG. 5 is a transverse sectional view of the motion transfer device and position lock taken along section line 55 of FIG. 3.

FIG. 6 is a top view of the motion transfer device showing the driver engaging the wheel and lock portion in full lines, and the reversed position of the wheel and lock in phantom lines.

FIG. 7 is a transverse sectional view of the motion transfer device taken along section line 77 of FIG. 6.

FIG. 8 is a transverse longitudinal sectional view of the subject motion transfer device and position lock taken along section line 88 of FIG. 6.

FIG. 9 is a perspective view of the wheel and lock member of the subject motion transfer device and posi- 7 tion lock.

FIG. 10 is a top view of the wheel and lock shown in perspective in FIG. 9.

FIG. 11 is a sectional view of the wheel and lock member shown in FIG. 10, taken along section line 1111 of FIG. 10.

FIG. 12 is a perspective view of the driver member of the subject motion transfer device and position lock.

FIG. 13 is a top view of the driver shown in FIG. 12.

FIG. 14 is an enlarged, partially broken, sectional view of the end portion of the driver shown in FIG. 13 and taken along section line 1414 of FIG. 13.

FIG. 15 is a perspective view of the lift arm member of the subject motion transfer device and position lock.

FIG. 16 is a top view of the lift arm shown in perspective in FIG. 15.

FIG. 17 is a front elevation of the spring tube member of the motion transfer device and position lock with a partial longitudinal section portion cut away at the midportion thereof.

Referring now to the drawings, and more particularly FIG. 1, it will be seen that a motion transfer device illustrative of the present invention is shown in perspective. The subject motion transfer device 10 translates the reciprocating motion of the power unit 16 into an inter-' mittent combined rotational and axial movement of a main or driven shaft 14. This in turn imparts to the tool arm 12 a combined rotational and axial movement which, because of the mechanism contained inside the housing 11, positively positions and locks the tool arm 12 at the terminal portion of its rotational movement. The positioning lock is achieved by the combined action of the wheel and lock member 2 which cooperates with the driver 4 (see FIG. 2) to both dynamically and statically effectuate the positive positioning at the two ends of rotation by the cooperative action of the universal pin 100. The arcuate shoulders in the wheel and lock 2 cooperate with the peripheral circular a-rcuate portion of the driver 4 to achieve the aforementioned result, it being appreciated that the wheel and lock member 2, being firmly fixed to the main shaft 14, moves axially of the main shaft 14 while the position axially of the driver {J The actual rotation of the wheel and lock 2 is provided by the engagement between the follower 38 on the driver 4 and the drive slot 126 (see FIGS. and 11) of the wheel and lock 2.

In greater detail, it will be observed that the entire structure is susceptible of encasing in a sealed case 18 which includes a top cover 20, a bottom cover 22, which are united by the top plate screws 24 and the top plate locating dowels 26, along with the bottom plate screws 116 and the bottom plate locating dowels 118.

The detailed construction is illustrated in FIG. 2 where it will be seen that the tool arm 12 and switch arm 28 are both clampingly secured to the main shaft 14. A switch arm clamping bolt threadedly engages the split end portion of the switch arm 28, and the switch shafts 32 are secured in place by means of the switch nuts 30.

The wheel and lock 2 is secured to the main shaft 14 by means of wheel and lock clamp bolts 34 which threadedly engage the split end portion of the wheel and lock 2. The driver 4, in a similar manner, is secured to the driver shaft 46 by means of the driver clamp bolts 36. A follower 38 is threadedly engaged to the arm portion of the driver 4 and in turn engages the drive slot 126 beneath the wheel and lock 2.

A pair of thrust collars 42 are provided on the driver shaft in order to adequately locate the same, the driver shaft key 44 serving additionally to lock the driver in place on the shaft.

A driver shaft gear 46 engages the rack 56, and collar 48 receives the locking pin 52 which engages the locking pin driver shaft hole 54 thereby locking the gear in place on the driver shaft. Locking sleeve is journaled on the driver shaft 413, and the driver shaft rotatable guide 8%) fits within the gear 46 thereby journalin'g the same for rotation on the driver shaft boss 128 provided on the base plate 22.

As referred to above, the rotation of the driver shaft 41') is effected by the rack 56 which is driven by the drive mechanism 16, the same being secured by the rack coupler 64 to the rack 56. A cam 58 is secured to the top of the rack 56, and set screw 62 locks the rack coupler 64 in engagement with the rack 56. The cam mounting screws 66 are positioned from beneath the rack, and recessed therein, to secure the cam 58 on top of the rack 56. It will be appreciated that various cams can be positioned on the rack to vary the amount of lift imparted to the tool arm 12, and also the acceleration of the axial motion.

A lift lever 66 including a lift lever yoke 68 is provided to impart the axial motion to the main shaft 14. The lift collars 70 are coupled to the main shaft 14 and secured in place by means of the joint action of the lift collar spacer 72 and the lift collar assembly bolt 74. The lift collars are positioned by the lift collar spacer 72 to fiankingly engage the lobes of the lift lever yoke 68 and thereby permit the lift lever 66 to raise and lower the shaft 14 responsive to the reciprocating motion of the rack 56 and its associated cam 58. The cam 58, in this regard, engages and raises and lowers the cam follower 76. The rack guide 78 rollingly engages the flat rear portion of the rack 56, with the rack guide plate 122 serving the balance of the orienting function.

The lift lever 66 is pivotally mounted between a pair of lift lever mounting trunnions 120 by means of the lift lever pivot pin which swivels within the lift lever pivot bushings 92. The lift lever pivot set screw 94 locks the lift lever on the lift lever pivot so that the return spring 82 which compressively engages the lift lever spring detent 88 can constantly serve to pivot the lift lever so that the cam follower 76 is in constant engagement with the cam 58. The return spring 82, because it is the subject of constant flexing and can be broken in operation, is housed within the return spring tube 84 which extends to the outer portion of the case 18 (see FIG. 1). The threaded end 86 of the spring tube 4- 84 is inserted into the casing 18 in a threaded bore contained therein. As indicated earlier, the entire unit can operate in an oil bath, and for this purpose filler cap and gauge 96 is provided which threadedly engages a hole in the top cover 20, and drain plug 98 is provided to threadedly engage a hole in the base 22 for draining the oil.

The axial travel of the main shaft 14 is controlled by the abutting relationship between the depth stop 102 and the depth stop boss 130 on the top plate 20. A depth stop lock 194 is provided so that jointly with the depth stop 102 they can be moved upwardly and downwardly on the depth stop adjusting threads 112 on the main shaft 14. Referring now to the uppper right hand portion of FIG. 2, it will be observed that the too-l and switch arm key 103 locks the switch arm 28 in position on the main shaft 14. Similarly, the wheel and lock key secures the wheel and lock 2 on the main shaft 14. A main shaft bushing 114 is inserted interiorly of the depth stop boss and guides the main shaft 14 for rotation at its upper potrion, the lower potrion being guided as will be described in detail hereafter.

The relationship between several of the components and the casing 18 is apparent on FIG. 5. There it will be seen that the universal pin 1% at the end of the wheel and lock 2 is adapted to fit within the terminal lock bushing 132 which in turn fits within the terminal lock bushing boss 134 cast in the wall of the casing 18. A similar terminal lock bushing boss 134 and bushing 132 are in the upper right hand corner of FIG. 3, thereby serving to precisely position the wheel and lock 2 at both ends of its travel. The return spring 82 and its associated return spring tube 84 are secured to the return spring tube mounting boss 136 (see FIG. 4) by means of the threaded end 86 of the return spring tube 84. The spring 82, as noted in FIGS. 3 and 4, extends outwardly from the boss 136 and fits within the lift lever spring detent 88 to push the lift lever 66 constantly at its operating end in the downward position. As will be observed in FIG. 4, the lift lever yoke 68 is flanked by the lift collars 70, and is in the lower position where the stroke of the power unit 16 is at the fullest extremity.

Referring now to FIG. 7, it will be seen that the case 13 in addition to supporting the main shaft 14 by means of the depth stop boss 130 on the top cover 20, additionally is supported by means of the main shaft lower support boss 138. Referring to FIG. 8, the relationship between the power unit 16, the power shaft 146, and the rack coupler 64 is best illustrated. The rack 56 threadedly engages the power shaft 146 and the cam 58 fastened atop the rack 56 by means of the cam mounting screws 60 engages the cam follower 76 and actuates the lift lever 66 responsive to the reciprocation of the power shaft 140. The rack guide plate 122 in combination with the rack guide 78 constrain the rack 56 for reciprocating motion as does the power shaft 140.

The locking action which is both dynamic and static is a direct function of the construction of the wheel and lock 2 and the driver 4, which are illustrated in greater detail in FIGS. 9 through 14. These cooperate with the yieldable urging to eliminate lost motion which is a function of the lift lever 66 as best illustrated in FIGS. 15 and 16.

In FIG. 9 it will be seen that the wheel and lock 2 is in the shape generally of an anchor with a bent handle.

A pair of lock arms 146 extend laterally from the shaft bore 142 which is slotted with a clamping slot 144 in order to clampingly and adjustably engage the main shaft 14. Each of the lock arms 146 is provided with a forwardly facing arcuate locking shoulder 148 which is a portion of a circle and finished to a smooth surface. The positioning arm 150 extends from the upper portion of the unit (see cross-section in FIG. 11) and has an arm offset 154 in order to accommodate the motion as best shown in the earlier figures. A universal pin mount 152 is provided in the end of the positioning arm 150 in order to receive the universal pin 100 which, in turn, engages the terminal lock bushings 132 to positively position the main shaft 14 at the two terminal ends of rotation. The drive slot 126 provided in the underneath portion of the main body of the position arm 159 has a diverging tapered base 158 which accommodates the follower 38 in its engagement with the walls of the drive slot 126.

The driver 4, as shown in FIGS. 12, 13 and 14, has as its principal element a driver arcuate face 160 which conforms to the major portion of a cylindrical surface. A clamping slot 162 is provided at the external radius and, in conjunction with the clamp bolt bore 164, receives the clamping bolts 36 to lock the same on the driver shaft 40. A key slot 172 is provided in the bore in order to receive the driver shaft key 44. A wheel and lock relief cut 166 interrupts the cylindrical face of the driver arcuate face 160, and as will become apparent from a study of FIGS. 3 and 6, is proportioned to accommodate the lock arm and lock arm offset 154 of the wheel and lock 2. A follower support arm 168 extends in diametrically opposed relation to the clamping slot 162 and terminates in an upswept follower mount 170. A threaded bore 174 is provided within the follower mount 170 to receive the follower 38 and secure the same in position for its subsequent engagement in the drive slot 126 of the wheel and lock 2.

The lift lever 66 is shown in detail in FIGS. 15 and 16. There it will be observed that the left lever 66 comprises a lift lever body portion 178 which terminates at its outer extremity in the lift lever yoke 68 which comprises two lift lever yoke lobes 176. The lift lever lobes 176 have contoured upper and lower faces which frictionally engage the lift collars 70 (see FIG. 4). The lift lever operator 186 extends at approximately right angles with the lift lever body 178, and at the intersection of both members there is provided a boss portion having a lift lever pivot bore 182 which receives the lift lever pivot 90. Lift lever pivot set screw mount 184 which is an internally threaded bore receives the lift lever pivot set screw 94 which in turn engages the flat on the lift lever pivot 90. A cam follower offset mount 186 extends upwardly from the lift lever body 178, and is provided with a cam follower mounting bore 188 which is threaded to receive the threaded shaft portion of the cam fol lower 176.

The return spring tube 84, as shown in FIG. 17, has a hexagonal exterior configuration to permit it to serve as its own nut for threadedly engaging the tube threaded end with the internally threaded return spring tube mounting boss 136 on the casing 18. The interior portion of the return spring tube 84 has a hollow bore defining a return spring retaining chamber 190, which houses the return spring 82 and retains it to compressively engage the lift lever return spring detent 88.

The combined operation of the wheel and lock 2 with the driver 4 and lift lever 66 is such as to constantly overcome any lost motion attributable to friction and the tolerances of manufacture. The arcuate face 160 of the driver 4 is proportioned to rotatably and axially engage the arcuate locking shoulder 148 of the wheel lock 2. In this manner positive positioning is achieved for the main shaft 14 and its associated tool arm 12, with a final precise positioning determined by the universal pin 100 which, at the end of the axial movement, engages the terminal lock bushing 132. This follows because the driver 4 (compare FIGS. 3 and 6) rotates approximately 45 before rotation of the wheel and lock 2 begins. External adjustment is provided by means of the various controls which operate the power unit 16, the same being readily detachable by means of merely rotating the power shaft 140 to disengage the threaded engagement of the rack coupler 64. Similarly, the return spring tube 84 can be readily removed from the casing 18 in order to accomplish changes in the spring. Both of the foregoing changes can be accomplished without removing the top cover 20 or the bottom cover 22 from the unit. If further disassembly is required, the oil can be readily drained, and the entire unit repaired or modified. It is contemplated that changes in the cam 58 might be made, and as will be observed, this can be accomplished (see FIG. 8) when the power shaft is in the fully retracted position and access may be had by removing the top cover 20. For varying rises of the tool shaft 12 as well as the timing thereof, differing cams 58 may be employed. The positioning of the arcuate shoulders on the wheel and lock 2 are such as to provide for 90 rotation of the wheel and lock. Since the driver 4 (again compare FIGS. 3 and 6) rotates approximately 45 at the beginning and the end of its stroke, its total motion of produces a rotation of approximately 90 of the wheel and lock 2. It is contemplated that differing degrees of rotation can be provided, but for the bulk of the commercial applications 90 is effective. The degree to which the main shaft 14 and tool arm 12 moves axially is a function of the adjustment of the depth stop 162 and the configuration of the cam 58.

While the invention has been described in connection with specific embodiments and applications, it is not applicants intention to restrict himself thereto, but to include within the invention all of the subject matter defined by the spirit as well as the letter of the annexed claims.

I claim:

1. In a motion transfer device of the character which translates reciprocating motion into intermittent combined rotational and axial movement of a driven shaft, the improved positioning mechanism comprising, in combination, a wheel and lock, said wheel and lock having shaft attachment means for engaging the driven shaft, a pair of lock arms integral with the wheel and lock extending from the shaft attachment means, a positioning arm extending from the shaft attachment means and between the lock arm, arcuate shoulder means defined in the lock arms in flanking relationship with the positioning arm, slot means in the positioning arm flanked by the arcuate shoulders, a drive mounted on a driver shaft parallel to the driven shaft, an arcuate locking face on the driver proportioned to be rotatably and dwellingly engaged by the arcuate shoulders on the wheel and lock, and follower means on the driver drivingly engaging the positioning arm slot, the whole being oriented and proportioned to effect a rotation of the wheel and lock responsive to a rotation of the driver with the driver locking face engaging the arcuate shoulders of the wheel and lock at the termination of the driver rotation thereby radially positioning the positioning arm at its two extremes of motion while permitting limited axial travel of the wheel and lock and its attached driven shaft.

2. In the motion transfer device of claim 1, lift lever means comprising a yoke arm, an operator arm, pivot means connecting the arms and constraining the same for joint movement, yieldable means engaging the operator arm, and yoke means on the yoke arm operatively connected to the driven shaft to translates the action of the yieldable means on the operator arm into an axial urging of the driven shaft.

3. In a motion transfer device of the character which translates reciprocating motion into intermittent combined rotational and axial movement of a driven shaft, the improved positioning mechanism comprising, in combination, a wheel and lock, said wheel and lock having shaft attachment means for engaging the driven shaft, a pair of lock arms extending radially from the shaft attachment means, a positioning arm extending outwardly from the shaft attachment means, arcuate shoulder means defined in the lock arms in flanking relationship with the positioning arm, slot meaans in the positioning arm flanked by the arcuate shoulders, a driver mounted on a driver shaft parallel to the driven shaft, an arcuate locking face on the driver proportioned to be rotatably and dwellingly engaged by the arcuate shoulders on the wheel and lock, and follower means on the driver engaging the positioning arm slot, the whole being oriented and proportioned to effect a 90 rotation of the wheel and lock responsive to a 180 rotation of the driver with the driver locking face engaging the arcuate shoulders of the wheel and lock at the termination of the driver rotation thereby radially positioning the positioning arm at its two extremes of motion while permitting limited axial travel of the wheel and lock and its attached driven shaft.

4. In a motion transfer device of the character which translates reciprocating motion into intermittent combined rotational and axial movement of a driven shaft with positive positioning at the termination of the motion, the improved positioning mechanism comprising, in combination, a housing, a wheel and lock, said wheel and lock having shaft attachment means for engaging the driven shaft, a pair of lock arms extending radially from the shaft attachment means, a positioning arm extending outwardly from the shaft attachment means, arcuate shoulder means defined in the lock arms in flanking relationship with the positioning arm, slot means in the positioning arm flanked by the arcuate shoulders, positive position means on the positioning arm, position means coacting means on the housing adapted to coact with the position means on the positioning arm, a driver mounted on a driver shaft parallel to the driven shaft, an arcuate locking face on the driver rotatably and dwellingly engaging the arcuate shoulders on the wheel and lock, and follower means on the driver proportioned to engage the positioning arm slot, the whole being oriented and proportioned to effect a 90 rotation of the wheel and lock responsive to a 180 rotation of the driver with the driver locking face engaging the arcuate shoulders of the wheel and lock at the termination of the driver rotation thereby radially positioning the positioning arm at its two extremes of motion and yet permitted limited axial travel of the wheel and lock and its attached driven shaft.

5. In a motion transfer device of the character which translates reciprocating motion into intermittent combined rotational and axial movement of a driven shaft with positive positioning at the termination of the motion, the improved positioning mechanism comprising, in combination, a housing, a wheel and lock, said wheel and lock having shaft attachment means for engaging the 'driven shaft; a pair of lock arms extending radially from the shaft attachment means, a positioning arm extending outwardly from the shaft attachment means, arcuate shoulders defined in the lock arms in flanking relationship with the positioning arm, slot means in the positioning arm flanked by the arcuate shoulders, positive position means at the end of the positioning arm, position means coacting means on the housing adapted to coact with the position means on the positioning arm, a driver mounted on a driver shaft parallel to the driven shaft, an arcuate locking face on the driver rotatably and dwelling engaging the arcuate shoulders on the wheel and lock, follower means on the driver proportioned to engage the positioning arm slot, and yieldable means engaging the driven shaft instantly urging the same along its axis, the whole being oriented and proportioned to effect a 90 rotation of the Wheel and lock responsive to a 180 rotation of the driver with the driver locking face engaging the arcuate shoulders of the wheel and lock at the termination of the driver rotation thereby radially positioning the positioning arm at its two extremes of motion and yet permitting limited axial travel of the wheel and lock and its attached driven shaft.

6. In a motion transfer device of the character which translates reciprocating motion into intermittent combined rotational and axial movement of a driven shaft,

the improved positioning mechanism comprising, in combination, a wheel and lock, said Wheel and lock having shaft attachment means for engaging the shaft, a pair of lock arms extending from the shaft attachment means, a positioning arm extending from the shaft attachment means, arcuate shoulders defined in the lock arms in flankmg relationship with the positioning arm, slot means in the positioning arm, a driver mounted on a driver shaft parallel to the driven shaft, an arcuate locking face on the driver proportioned to be rotatably and dwellingly engaged by the arcuate shoulders on the wheel and lock, follower means on the driver engaging the positioning arm slot, spaced collar means on the driven shaft, pivoted lift lever means engaging the space-d collar means, and yieldable means urgingly engaging the lift lever means thereby axially urging the drive shaft, the whole being oriented and proportioned to effect a rotation of the wheel and lock responsive to a rotation of the driver with the driver locking face engaging the arcuate shoulders of the wheel and lock at the termination of the driver rotation thereby radially positioning the positioning arm at its two extremes of motion and yet permitting limited axial travel of the wheel and lock and its attached driven shaft.

7. A motion transfer device comprising, in combination, a driven shaft, journal means journaling said driven shaft for rotational and axial movement, a wheel and lock, said wheel and lock including a pair of lock arms in opposed relation, attachment means for attaching said wheel and lock to said driven shaft, means defining arcuate locking shoulders in each of the locking arms, a slot positioned midway between the arcuate locking shoulders and extending radially from the attachment means, a positioning arm extending radially from the attachment means, a driver, a driver shaft journaled for rotation parallel with said drive shaft and carrying the driver, an arcuate locking face on the driver proportioned to be rotatably dwellingly engaged by the arcuate shoulders on the wheel and lock, follower means on the driver drivingly engaging the positioning arm slot, a rack, drive means for reciprocating the rack, a cam member on said rack, gear means on the driver shaft engaging the rack and rotating the driver shaft responsive to the reciprocating movement of the rack, a lift lever, said lift lever having follower means engaging the cam on the rack, a yoke portion on said lift lever, collar means on the driven shaft, said collar means engaging the lift lever yoke portion to axially shift the driven shaft responsive to movement of the yoke means, an operator arm on said lift lever, yieldable means engaging said operator arm, position means on the position arm, a housing, said housing including fixed position means engaging members, yieldable means secured externally of said housing and engaging the operator arm of the lift lever, and a reciprocating power unit coupled to the rack thereby reciprocating the rack, and rotatably and axially moving the driven shaft, said rotation being dynamically locked at the near termination of each reciprocation by the engagement of the arcuate driver face with the arcuate shoulders on the lock arms, the axial motion of the driven shaft being imparted by the cam on the rack to the lift lever, and the position of the driven shaft being positively determined at the end of each reciprocation by the engagement of the position means on the position arm with the position means engaging members on the housing.

References Cited by the Examiner UNITED STATES PATENTS 2,144,305 1/1939 Brisbane 74-20 MILTON KAUFMAN, Primary Examiner. BROUGHTON DURHAM, Examiner. 

1. IN A MOTION TRANSFER DEVICE OF THE CHARACTER WHICH TRANSLATES RECIPROCATING MOTION INTO INTERMITTENT COMBINED ROTATIONAL AND AXIAL MOVEMENT OF A DRIVEN SHAFT, THE IMPROVED POSITIONING MECHANISM COMPRISING, IN COMBINATION, A WHEEL AND LOCK, SAID WHEEL AND LOCK HAVING A SHAFT ATTACHMENT MEANS FOR ENGAGING THE DRIVEN SHAFT, A PAIR OF LOCK ARMS INTEGRAL WITH THE WHEEL AND LOCK EXTENDING FROM THE SHAFT ATTACHMENT MEANS, A POSITIONING ARM EXTENDING FROM THE SHAFT ATTACHMENT MEANS AND BETWEEN THE LOCK ARM, ARCUATE SHOULDER MEANS DEFINED IN THE LOCK ARMS IN FLANKING RELATIONSHIP WITH THE POSITIONING ARM, SLOTS MEANS IN THE POSITIONING ARM FLANKED BY THE ARCUATE SHOULDERS, A DRIVE MOUNTED ON A DRIVER SHAFT PARALLEL TO THE DRIVEN SHAFT, AN ARCUATE LOCKING FACE ON THE DRIVER PROPORTIONED TO BE ROTATABLY AND DWELLINGLY ENGAGED BY THE ARCUATE SHOULDERS ON THE WHEEL AND LOCK, AND FOLLOWER MEANS ON THE DRIVER DRIVINGLY ENGAGING THE POSITIONING ARM SLOT, THE WHOLE BEING ORIENTED AND PROPORTIONED TO EFFECT A ROTATION OF THE WHEEL AND LOCK RESPONSIVE TO A ROTATION OF THE DRIVER WITH THE DRIVER LOCKING FACE ENGAGING THE ARCUATE SHOULDERS OF THE WHEEL AND LOCK AT THE TERMINATION OF THE DRIVER ROTATION THEREBY RADIALLY POSITIONING THE POSITIONING ARM AT ITS TWO EXTREMES OF MOTION WHILE PERMITTING LIMITED AXIAL TRAVEL OF THE WHEEL AND LOCK AND ITS ATTACHED DRIVEN SHAFT. 